Print Email Facebook Twitter Exploring sustainable sand-winning in the White Volta Title Exploring sustainable sand-winning in the White Volta: Estimating transient storage upstream of run-of-river weirs for sand winning purposes via hec-ras 6, 1-d, flume models Author Arends, Jon (TU Delft Civil Engineering & Geosciences; TU Delft Water Management) Contributor van de Giesen, N.C. (mentor) Marence, M. (graduation committee) Wauben, Marcel (graduation committee) Degree granting institution Delft University of Technology Programme Civil Engineering Date 2022-04-29 Abstract This research aims to explore sediment transport behavior and accumulation caused by run-of-river weirs in order to examine there feasibility for sustainable sediment mining purposes in the White Volta River. Weirs are used to raise water levels up-stream to increase water levels and storage, but their is little information regarding sediment continuity and transport over a weir. Observational research studies suggest that weirs do not have a 100% trapping efficiency, however, due to the reduced flows this study hypothesizes that sediment will settle upstream of the structure.Based on data from the White Volta River, a 1D Flume model is created usingHEC-RAS which tests several sediment transport functions and bed roughness parameters with constant bed slope, suspended and bed-load gradation in order to estimate sediment settling. The results suggest that during peak discharge events settled sediments are flushed up and over the weir. As peak discharges decrease, settling occurs based on particle diameter causing increased sediment storage up-stream until the next flushing event. The volume of sediment stored ramp is highly variable with respect to bed roughness and the used transport function, suggesting river calibration is required for concrete estimates. Based on the model results, approximately 1 − 2% of the White Volta’s yearly suspended load settles in-front of the structure before the discharge flushing event. Subject sand winningwhite voltaSediment transportHEC-RASWeirs To reference this document use: http://resolver.tudelft.nl/uuid:abe1aa18-fb10-4a6c-ad3a-9287f31a9839 Part of collection Student theses Document type master thesis Rights © 2022 Jon Arends Files PDF Jon_Arends_Thesis.pdf 13.15 MB Close viewer /islandora/object/uuid:abe1aa18-fb10-4a6c-ad3a-9287f31a9839/datastream/OBJ/view